Hello,
I just registered in this arduino forum.
The registation page (with the captcha, linked to in the upper right corner of the page when not logged in) is broken. the Javascript on the page does not work for Internet Explorer. It is so much broken that it does not show the captcha at all. So I needed to use another browser. Also the Safari browser on iOS showed some error warnings in the debug console, but it was usable there.
greets,
chippy